package com.example.jianbing.juc;

import java.sql.SQLOutput;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @ClassName : ThreadOrderAccess
 * @Description :
 * @Author : JB
 * @Date: 2020-08-04 20:52
 */

class ShareResourse{
    private int number  = 1;   // 1:A   2:B  3:C
    public Lock lock = new ReentrantLock();
    public Condition condition1 = lock.newCondition();
    public Condition condition2 = lock.newCondition();
    public Condition condition3 = lock.newCondition();
    public  void print5() throws InterruptedException {
        lock.lock();
        try {
            //1.判断
            while(number != 1){
                condition1.await();
            }
            //2.干活
            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.通知
            number = 2;
            condition2.signal();
        }finally {
            lock.unlock();
        }
    }
    public  void print10() throws InterruptedException {
        lock.lock();
        try {
            //1.判断
            while(number != 2){
                condition2.await();
            }
            //2.干活
            for (int i = 0; i < 10; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.通知
            number = 3;
            condition3.signal();
        }finally {
            lock.unlock();
        }
    }
    public  void print15() throws InterruptedException {
        lock.lock();
        try {
            //1.判断
            while(number != 3){
                condition3.await();
            }
            //2.干活
            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.通知
            number = 1;
            condition1.signal();
        }finally {
            lock.unlock();
        }
    }
}

/***
 * 多线程之间按顺序调用，实现A->B->C
 * 三个线程启动，要求如下：
 * AA打印5次，BB打印10次，CC打印15次
 * 接着
 * AA打印5次，BB打印10次，CC打印15次
 * 。。。来10轮
 *
 *步骤：
 *  *       1.高内聚低耦合下，线程操作资源类
 *  *       2. 判断/干活/通知
 *  *       3. 多线程交互中，必须要防止多线程的虚假唤醒，不能用if做判断,用while(循环监听)
 *  *       4. 标志位
 */
public class ThreadOrderAccess {
    public static void main(String[] args) {
        ShareResourse shareResourse = new ShareResourse();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    shareResourse.print5();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    shareResourse.print10();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"B").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    shareResourse.print15();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();
    }
}
